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SUBTRACTION Self-Correcting Quiz - NINES

1
12
-  9
2
16
-  9
3
10
-  9
4
15
-  9
5
14
-  9
6
11
-  9
7
17
-  9
8
13
-  9
9
13
-  9
10
11
-  9
11
10
-  9
12
15
-  9
13
12
-  9
14
16
-  9
15
18
-  9
16
18
-  9
17
14
-  9
18
17
-  9
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